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Psammothidium harveyi is easily distinguished from other species of the genus by its lanceolate valves with rostrate apices. Psammothidium altaicum is most similar in shape, but is smaller and the valve apices are not protracted.

LM scalebar = 10 µm
Psammothidium harveyi LM4 Psammothidium harveyi LM1 Psammothidium harveyi LM2 Psammothidium harveyi LM3 Psammothidium harveyi LM5 Gc44254  Acharvey 1B Gc44254  Acharvey 1C
Length Range
10-29 µm
Width Range
7.0-9.5 µm
Striae in 10 µm
22-25

Also compare to

Psammothidium altaicum

(V.S.Poretzky) Bukht. in Bukht. and Round

BioData Reference
Krammer and Lange-Bertalot 2/4 Pl 20 Fig 24-32